<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>css优先级</title>
		<style type="text/css">
			/* #d1{
				color:blue;
				font-size: 59px;
			} */
			div{
				color:red;
			}
			
			.c3{
				background-color: aqua;
				color: brown;
			}
			.c2{
				color: yellow;
			}
			
		</style>
	</head>
	<body>
		<div id="d1" class="c2 c3">
			今年情况真的好难
		</div>
	</body>
</html>